Adapter simples para Strings em RecyclerView

contatinho_item_lista.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="64dp"
    android:id="@+id/container">

    <TextView
        android:id="@+id/tvNome"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center_vertical"
        android:textSize="20sp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:text="Nome"/>

</LinearLayout>

ContatinhoAdapter.kt

package br.com.brunoazevedo.contatinhos

import android.content.Context
import android.support.v7.widget.RecyclerView
import android.view.View
import android.view.ViewGroup
import android.view.LayoutInflater
import kotlinx.android.synthetic.main.contatinho_item_lista.view.*

class ContatinhoAdapter(val contatinhos: List<String>)
    : RecyclerView.Adapter<ContatinhoAdapter.ViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.contatinho_item_lista, parent, false)
        return ViewHolder(view)
    }

    override fun getItemCount(): Int {
        return contatinhos.size
    }

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bindView(contatinhos[position])
    }

    class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {

        fun bindView(contatinhoNome: String) {
            itemView.tvNome.text = contatinhoNome
        }

    }
}